Feed-water heater.



PATENTED MAY 7, 1907.

T. Y. STEWART.

FEED WATER. HEATER.

APPLICATION FILED DEG-27,1904.

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PATENTED MAY 7, 1907.

T. Y. STEWART. FEED WATER HEATER.

APPLICATION FILED 1350.27, 1904.

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UNITED STATES PATENT OFFIO THOMAS YOUNG STEWART, OF ST. PAUL, MINNESOTA, ASSIGNOR, BY DIRECT AND MESN E ASSIGNMENTS, OF FIVE-SIXTHS TO SAID THOMAS Y; STEW- ART AND RONALD STEWART.

FEED-WATER HEATER.

Specification of Letters Patent.

Patented May 7,1907.

To all whom it may concern:

Be it known that I, THOMAS YOUNG STEW- ART, of St. Paul, Ramsey county, Minnesota, have invented certain new and useful Imrovements in Feed-Water Heaters and Puriers, of which the following is a specification.

This invention relates to improvements in devices designed for heating and purifying water that is to be fed to a steam boiler, and the object that I have in view is to provide a device of this character that will be simple and inexpensive in construction, effective in operation, and take up but a small amount of space so that it may be used upon locomotives, as well as in connection with stationary boilers.

The invention consists generally in the constructions and combinations hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a longitudinal sectional view of a feed water heater and purifier embodying my invention. Fig. 2 is a transverse vertical section on line 22 of Fig. 1. Fig. 3 is a partial vertical section on line 33 of Fig. 1. Fig. 4 is a partial horizontal section on line -i4 of Fig. 1.

In the drawing, 2 represents the main separating chamber consisting preferably of a piece of cylindrical pipe of any suitable length. One end of this pi e is secured to cylinder 3 by means of a anged plate 5. The 0 posite end of the chamber 2 is connected to a tube sheet 6 and a header 7 by means of a flanged plate 8 and suitable bolts 9. Arranged within the cylinder 3 is a tube sheet 10 and the header 11 secured to the wall of the cylinder by suitable means, such as a bolt 12. The header 11 is secured to the tube sheet 10 by the bolts or screws 13, and said header and tube sheet rest upon a bracket 14 secured to the inner wall of the cylinder. A series of copper tubes 15 pass through the chamber 2 having their ends passing through the tube sheets 6 and 10. The forward ends of the tubes are secured in a plate 16 that is secured to the tube sheet 6 by suitable screws or bolts 17. Suitable packing may be provided around each tube between the lates 6 and 16 (see Fig. 1.) A steam inlet pipe 18 is connected to the header 7, and a water inlet pipe 19 is connected to the chamber 2.

A series of transverse plates 20, preferably formed of zinc, are arranged within the chamber 2 and surrounding the tubes 15, each of said plates being provided with a series of openings through which said tubes pass. The plates 20 are cut away alternately at top and bottom so as to form a zig-zag water passage through said chamber, thereby causing the water that enters the chamber through the pipe 19 to pass back and forth from one side of the chamber to the other around the tubes 15, as indicated by the arrows in Fig. 1. The cylinder 3 is preferably provided with a top 21 and a bottom 22 and the part of the cylinder below the tubes 15 forms a settlings chamber. A series of erforated circular zinc plates 23 are preferafily arranged in this chamber. The bottom of the chamber is also preferably rovided with a suitable waste ipe 24 which may be provided with a suitab e valve.

The upper part of the cylinder 3 is provided with a horizontal partition 25, and a second horizontal partition 26 preferably at a lower level than the partition 25. An upright perforated wall 27 connects the partitions and 26. Above the partition 25 is a chamber 28 provided with a series of baffle plates 29 perforated near their up er and lower edges, and connected to this c amber is the water outlet pipe 30. A pi e 31 is preferably connected to the space etween the header 12 and the tube sheet 10 and eX- tends lengthwise of the chamber 2 near the bottom thereof and through the tube sheet 6, the plate 16 and the header 7. This pipe carries off the water of condensation from the header 11.

Operation: The operation of the device is as follows: The water is fed bysuitable means, such as an injector, through the pipe 19 into the separating chamber 2. It passes along in said chamber between the plates 20, by which it is compelled to ass back and forth from one side of the c amber to the other and between and around the copper tubes 15. As the water passes back and forth from one side of the chamber to the other it is agitated and heated. As the plates are made of zinc and the tubes of copper a galvanic action is thereby obtained which, while it is insufficient to decompose the Water, gives suflicient direotivelforcefglto cause any oxygen in the water to go to the zinc plates and corrode them instead of corroding the boiler. It is for this purpose that I provide the zinc plates 23 in the bottom of the settlings chamber. These plates are easily removable and their use in the settlings chamber reduces the corrosion of the boiler.

I claim as my invention:

1. In a feed water heater and purifier, the combination, with a separating chamber provided at its ends with suitable tube sheets and headers secured to said tube sheets of a series of transverse zinc plates arranged in said chamber, alternate plates being provided with spaces between their edges and the wall of the chamber, and a series of copper tubes extending through said chamber and through openings in said plates, substantially as described.

2. In a feed water heater and urifier, the combination, with a separating c amber provided at its ends with suitable tube sheets, and headers inclosing said tube sheets, of a series of copper tubes extending through said chamber and having their ends arranged in said tube sheets, and a series of transverse zinc plates arranged in said chamber and provided with openings for the passage of said tubes, spaces being provided between the edges of alternate plates and the walls of the chamber, for the urpose set forth.

3. In a feed water eater and purifier, the combination, with a separating chamber, of a series of copper tubes extending through said chamber, a series of transverse zinc plates extending across said chamber and surrounding said tubes with spaces arranged at the edges of alternate plates, means for passing water through said chamber, and means for passing steam through said tubes, substantial l y as described.

4. The combination, with the cylinder 3, of the separating chamber 2 connected therewith, the series of copper tubes 15 arranged in said chamber, the series of transverse zinc plates 20 also arranged in said chamber, the series of zinc plates 23 arranged in said cylinder below said tubes, and suitable baffle plates arranged in the upper part of said cylinder.

5. In a feed water heater and urifier, the combination, with a separating-c amber provided at its ends with suitable headers, of a series of tubes extending through said chamher, one or more tube sheets supporting said tubes, a series of transverse plates arranged in said. chamber and provided with openings for the passage of said tubes, with spaces between the edges of alternate lates and the walls of the chamber, said p ates being are ranged in series throughout the body of said chamber, and a settlings chamber arranged below said separating-chamber and provided with a series of zinc plates.

In witness whereof, I have hereunto set my hand this 14th day of December 1904.

THOMAS YOUNG STEWART. Witnesses:

O. G. IIANSON, G. MAcNAMARA. 

